A slightly better UK page here.
What they don't say is why the Bible method fell from favor. Many of these rupture and/or dissolve on their own, so the Bible just triggers that, but it may be that there are concerns about collateral damage. My coworker's was on the back of her hand (i n the area of the common flexor tendon sheath from that diagram) and it stood out like the Devil's Tower, so it was pretty easy to deliver a sharp, targeted blow that didn't whale on the entirety of her hand.